If you're concerned about performance, Visual Studio Team Services hosts the world's largest Git repositories. (The largest being Windows itself.) And has to

If you're concerned about performance, Visual Studio Team Services hosts the world's largest Git repositories. (The largest being Windows itself.) And has to stay performant while doing it. Indeed, most people don't need to host repositories that large but we're proud that our performance scales out even to repositories that are massive. (ObDisclaimer: I work on VSTS.)